AJO, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(020080) AJO
From Year=1914 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	377	235	155	49	7	0	0	0	0	16	140	323	1301
60	233	127	70	16	2	0	0	0	0	4	64	188	703
57	159	79	38	6	1	0	0	0	0	2	35	123	441
55	117	54	23	3	0	0	0	0	0	1	22	87	308
50	46	17	4	0	0	0	0	0	0	0	5	31	104

Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
Table updated on Oct 31, 2012
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Western Regional Climate Center, wrcc@dri.edu